[oilpan] Fix iterators over member collections to return Result<T>

Source/wtf/HashSet.h

 /*
  * Copyright (C) 2005, 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 41 matching lines @@
 
         typedef typename ValueTraits::TraitType ValueType;
 
     private:
         typedef HashTable<ValueType, ValueType, IdentityExtractor,
             HashFunctions, ValueTraits, ValueTraits, Allocator> HashTableType;
 
     public:
         typedef typename Allocator::template IteratorWitness<HashSet>::Type IteratorWitnessType;
         typedef typename Allocator::DefaultArgument DefaultWitnessType;
-        typedef HashTableConstIteratorAdapter<HashTableType, ValueType> iterator;
-        typedef HashTableConstIteratorAdapter<HashTableType, ValueType> const_iterator;
+        typedef HashTableConstIteratorAdapter<HashTableType, ValueTraits> iterator;
+        typedef HashTableConstIteratorAdapter<HashTableType, ValueTraits> const_iterator;
         typedef typename HashTableType::AddResult AddResult;
 
         void swap(HashSet&);
 
         int size() const;
         int capacity() const;
         bool isEmpty() const;
 
         iterator begin(IteratorWitnessType = DefaultWitnessType(0)) const;
         iterator end(IteratorWitnessType = DefaultWitnessType(0)) const;
@@ skipping 203 matching lines @@
         iterator end = collection.end();
         for (unsigned i = 0; it != end; ++it, ++i)
             vector[i] = *it;
     }  
 
 } // namespace WTF
 
 using WTF::HashSet;
 
 #endif /* WTF_HashSet_h */